Dental hand piece



Nov. 21, 1944. E. R PERTICS 2,363,141

DENTAL HAND PIECE Filed Feb. 27,.1945 2 Sheets-Sheet l )2 Q a s; 72PerZz'GS ikcoouxva v I g j K B Inventor Nov. 21, 1944. E. R. PERTICS2,363,141

DENTAL HAND PIE CE Filed Feb. 27, 1943 2 Sheets-Sheet 2 J l i Inven torWWW 19m Patented M 1, 1944 2,363,141 DENTAL HAND PIECE Ernest R.Per-tics, Lapel, Ina. Application February 27,. 1943, Serial No. 477,417

The present invention relates to new and useful improvements in dentalhand pieces, and has for its primary object to provide, in a manner, ashereinafter set forth, an instrument of this character comprisingnovelcooling-means, thus promoting patient comfort and consequently facili-It is thought that the operation of the device tating and expediting thework of the operator.

Other objects of the invention are to provide a dental hand piece of.the aforementioned char acter which will be comparatively simple inconstruction, strong, durable, highly efficient and reliable in use,compact, light in weight, and,

which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of theinvention will become apparent from a study of the followingspecification, taken in connection withthe accompanying c the shaft 6 inthe tubular handle -4. The 'refrigerant from the unit l2, circulatingthrough the 1 Claim. (01. 32-28) 9 receives a refrigerant from asuitable cooling unit 12. As shown in Figures .1 and 3,'the coil 9 hasinlet and outlet pipes l3 and I4, and the unit.

12 has inlet and outlet pipes l5 and I6, respectively connected by aflexibleyconduit I! provided with supply and return passages.

will be readily apparent from a consideration of the foregoing. Briefly,heat from the work, such as a tooth,is transmitted through the tool8 tocoil 9, rapidly absorbs the heat, thereby maintaining the tooth at acornfortabletemperature. It is believed that the many advantages of adental hand piece constructed in accordance with thepresent inventionwill be readily understood,

drawings, wherein like characters of reference 1 designate correspondingparts throughout the several views, and wherein:

Figure 1 is a view in side elevation of an embodiment of the apparatus.

Figure 2 is a view in side elevation of the hand.

piece with the upper portion thereof broken away.

Figure 3 is a vertical sectionalviewthro ugh the hand piece,takensubstantially on the line 3-3 of Figure 2.

Figure 4 is a View in horizontal section, taken substantially on theline 44of Figure 2,

Referring now to. the drawings in detail, it will be seen that referencenumeral l designates generally a conventional dental engine or unitcomprising the usual folding arm 2. Mounted on the arm 2 is a handpiece..3.

The hand piece 3 includes a tubular handle 4 i of suitable metal havingtherein a lining 5 of insulating material. the tubular handle 4 is ashaft 6. Achuck I on one end of the shaft 6 accommodates a dental drillor other tool; 8.

Mounted longitudinally m the tubular handle 4 is a coil 9 whichencircles theshaft 6. The tubular handle 4 hasformed therein alongitudinal, internal channel H! which accommodates the vapor returnlead ll of the coil 9. c The coil Journaled longitudinally in hand pieceand having refrigerant inlet and outand although a preferred embodimentof the instrument is as illustrated and described, it is to beunderstood that changes in the details of construction maybe resorted towhich will fall within the scope of the invention as claimed.

What is claimed is:

lining, a shaft journaled longitudinally in and projecting beyondone-end of said handle, said shaft being disposed axially of and spacedfrom the handle to provide a cylindrical chamber therebetween, and meansfor securing a tool on the projecting end of the-shaft, a coil for thepassage of a refrigerant mounted longitudinally in said chamber of thehandle and encircling the shaft,'said coil having refrigerant inlet andoutlet ends passing out of the other end of the i handle andbeingprovided with a straight return lead extending longitudinallyof thehandle outwardly of said coil, said handle having an internallongitudinal channel in which said return lead is positioned, a coolingunit remote from the let pipes, and flexible; conduit connections .be-

tween the inlets and outlets of the coil and the h H c i cooling unit.

In combination with a dental hand piece including a tubular handlehaving an insulating ERNEST R. PERTICS, h

